hydrothermal water treatment

Along with hydrogen production in the electrolysis process, oxygen is
produced as a by-product. Oxygen may be collected to provide an abundant
source of low cost oxygen to clean waste water for re-use or for benign
re-introduction to the environment. The oxygen may also be an additional
revenue source. The Linde Company, a well-known provider of industrial gas,
gives its customers guidance for utilizing industrial gases such as oxygen.
Linde's paper "Enhanced Waste Water Treatment with Pure Oxygen"1 may serve as a good reference to use the liberated oxygen in the hydrogen
fuel generation process.